Chain pipe-wrench



G. w. BUFFORD.

CHAIN PIPE WRENCH.

APPLICATION FILED MAR. 14. 1918.

1,327,309, Patented Jan. 6,1920.

INVENTOR Attorneys, M Q m 6 'b vw UNITED STATES PATENT oEEIoE.

GEORGE W. BUFFORD, OF BUFFALO, NEW YORK, ASSIGNOR TO 3'. H. WILLIAMS & COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

CHAIN PIPE-WRENCH.

Specification of Letters Patent.

Patented Jan. 6, 1920.

To all whom it may concern:

Be it known that I, GEORGE W. BUFFORD, a citizen of the United States of America, residing in Buffalo, Erie county, State of New York, have invented certain new and useful Improvements in Chain Pipe- Wrenches, of which the following is a specification.

This invention relates to improvements in chain pipe wrenches and aims to provide improvements therein.

The invention provides a chain pipe wrench with a flat link chain, which is more convenient in use, or handier and efficient than chain pipe wrenches with flat link chains heretofore in use.

All embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 illustrates, in side elevation, a wrench embodying the present invention;

Fig. 2 is a cross-section, on the line II-IJL Fig. 1;

Fig. 3 is a detail view, partly in section, of the connection between the chain and wrench.

In said drawings, letter A designates the stock, B, the jaw and C, the chain. The chain is a flat link chain composed of disks of steel 0 connected by pintles a, and hence its flexibility is mainly in a plane at right angles to the axes of the pintles. The jaw B may be of any type; that here shown being of the character disclosed and claimed in the a plication of Arnborn and Bufford, Serial bib. 64,266, filed November 30, 1915.

D designates the connection between the chain and the stock. The chain is connected to one end of the connection, as by means of the pin d. The connection comprises.

means, such as an eye 03, which is fastened to the stock in a manner to permit the connection D and chain 0 to swing around a pipe in a plane with the stock, as for example, by a pin d passing through lugs (1 upon the stock A.

Within the connection D there is provided a swivel, this being conveniently formed by making the connection in two parts, d and (2*, one with a socket d and the other with a shank d fitting within the socket and having its end flattened to bear upon a shoulder 0? within the socket.

The pivotal connection of the connection in a plane passing through the stock, and

the swivel admits of convenient manipulation in applying the chain to the pipe.

In pipe work, especially overhead work, it is usually most convenient and speedy for the workman to throw the chain over a pipe to one side of the jaw, and let the chain by its weight fall into approximate working position around the pipe, rather than to pass and feed the chain over and around the pipe in line with the jaw. Such an application of'the chain is readily effected with a welded link chain, and in the case of a flat link chain, may be eflected by utilizing the means provided by the present invention The combination of the pivotal and swivel connections permits of the strain on the swivel being taken axially of the swivel, and permits of easier turning of the parts of the swivel in the application of the chain around a pipe and in the use of the wrench.

The wrench, set forth herein, is broadly claimed in the application of Amborn and Bulfllord, Sr. No. 64,266, filed November 30, 19

What is claimed is 1. A wrench having a body portion comprising a jaw and a chain adapted to clamp the work against said jaw, said chain being composed of a series of pivoted links, the chain being flexible in one plane and substantially inflexible in a plane transverse of the pivotal axis of the links, having a swinging connection with the body of the wrench, and having a swivel connection between the swinging connection and the free end of the chain and being adjacent to said swinging connection.

2. A chain pipe wrench comprising a stock, a jaw, a chain, composed of a series of pivoted llIlKS, the chain being flexible in one plane and substantially inflexible in a plane transverse of the pivotal axis of the links, and a connection between the chain and stock, said connection having a pivotal connection with the stock and having a swivel therein.

In witness whereof, I have hereunto signed my name.

GEORGE W. BUFFORD. 

